package demo;
public class Computer {
    public void openComputer(){
        System.out.println("打开电脑");
    }
    public void closeComputer(){
        System.out.println("关闭电脑");
    }
    public void useIUSB(IUSB iusb){
        iusb.open();
        if(iusb instanceof Mouse)
        {
            Mouse mouse=(Mouse)iusb;
            mouse.click();
        }
        else if(iusb instanceof KeyBoard)
        {
            KeyBoard keyBoard=(KeyBoard)iusb;
            keyBoard.input();
        }
        iusb.close();
    }
}
